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Fair Value Of Financial Instruments (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($)
Derivatives, Fair Value [Line Items] |  |  |
Fair value measurement asset transfers into Level 3 | $ 0 | $ 0 |
Fair value measurement asset transfers out of Level 3 | 0 | 0 |
Transfers into or out of Level 3 | $ 0 | $ 0 |
Foreign Exchange Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding foreign exchange contracts | 0 |  | 0
Cell C [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Investment amount owned | $ 0.0 |  | $ 0.0
Equity method investment, percentage of ownership interest | 0.00% |  |
Cell C [Member] | Net1 SA [Member] | Class A [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Investment shares owned | shares | 75,000,000 |  |

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